Update SNAP BBCE gross income limits and Maryland LUA

[hua7450]

Summary

Closes #7028

Updates SNAP parameters to reflect recent policy changes:

1. BBCE gross income limits for NM, AK, and add missing SD
2. Maryland SUA and LUA historical values (backdated with correct January 1 effective dates)
3. Indiana LUA effective date corrections (May 1, not October 1)

---

BBCE Updates

File: policyengine_us/parameters/gov/hhs/tanf/non_cash/income_limit/gross.yaml

State	Previous	New Value	Effective Date	Source
NM	1.65	2.0	2024-10-01	NM HCA Announcement
AK	-.inf	2.0	2025-07-01	Alaska BBCE FAQ
SD	MISSING	-.inf	2020-07-01	Non-BBCE state

Also added period: year and label metadata.

---

Maryland Utility Allowance Updates

Maryland does not follow the federal fiscal year (October 1). Instead, Maryland's SUA and LUA are effective January 1 of each year.

Standard Utility Allowance (SUA)

File: policyengine_us/parameters/gov/usda/snap/income/deductions/utility/standard/main.yaml

Effective Date	Value	Source
2021-01-01	$388	AT 21-16
2022-01-01	$431	AT 22-10
2023-01-01	$505	AT 23-03
2024-01-01	$551	IM 24-32
2025-01-01	$557	USDA FY2025 SUA Table

Limited Utility Allowance (LUA)

File: policyengine_us/parameters/gov/usda/snap/income/deductions/utility/limited/main.yaml

Effective Date	Value	Source
2020-01-01	$240	AT 20-09
2021-01-01	$238	AT 21-16
2022-01-01	$264	AT 22-10
2023-01-01	$309	AT 23-03
2024-01-01	$337	IM 24-32
2025-01-01	$341	USDA FY2025 SUA Table

---

Indiana LUA Effective Date Correction

File: policyengine_us/parameters/gov/usda/snap/income/deductions/utility/limited/main.yaml

Indiana does not follow the federal fiscal year (October 1). Instead, Indiana's utility allowances are effective May 1.

Previous Date	Corrected Date	Value
2021-10-01	2021-05-01	$259
2024-10-01	2024-05-01	$274

---

Test plan

• Parameters load successfully
• All SNAP tests pass

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.17%. Comparing base (9739e2f) to head (04c2dae).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7029      +/-   ##
==========================================
- Coverage   76.92%   73.17%   -3.75%     
==========================================
  Files           1     3432    +3431     
  Lines          39    49462   +49423     
  Branches        4      263     +259     
==========================================
+ Hits           30    36193   +36163     
- Misses          8    13254   +13246     
- Partials        1       15      +14     

Flag	Coverage Δ
unittests	73.17% <ø> (-3.75%)	⬇️

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